diff --git a/README.md b/README.md
index 66aa98f..3094786 100644
--- a/README.md
+++ b/README.md
@@ -97,7 +97,7 @@ Specify the number of probes (1 by default)
 SET ivfflat.probes = 1;
 ```
 
-A higher value improves recall at the cost of speed, and it can be set to the number of lists for exact nearest neighbor search.
+A higher value improves recall at the cost of speed, and it can be set to the number of lists for exact nearest neighbor search (at which point the index won’t be used)
 
 Use `SET LOCAL` inside a transaction to set it for a single query